William joseph asiiworth



No. 618,!96. Patented Jan. 24, I899.

- W. J. ASHWURTH 8:. T. STEVINSON.

CENTBIFUGAL BOWL.

(Applicafion filed Aug. 28, 1597.

(No Modal.)

120205508. [Wen Z'ors.

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NrTEn STATES PATENT OFFICE.

WILLIAM J OSEPII ASIIWORTH, OF DURSLEY, AND THOMAS STEVINSON, OF GLOUCESTER, ENGLAND.

CENTRIFUGAL BOWL.

SPECIFICATION forming part of Letters Patent No. 618,196, dated January 24;, 1899.

Application filed A t 28, 1897. Serial NO- 649,835. (No model.)

To (LZZ whom, it may concern:

Be it known that we, WILLIAM JOsEPH Asnwonrn, residing atDursley, and THOMAS STEVINSON, residing at Gloucester, England, subjects of the Queen of Great Britain, have invented new and useful Improvements in the Manufacture of Bowls or Drums for Centrifugal Milk and Cream Separators, of which the following is a specification.

This invention relates to improvements in the manufacture of the bowls or drums of centrifugal machines for separating milk and cream.

The drums of centrifugal separating-machines as usually constructed are made of cast or stamped metal, and in order to permit of their withstanding the centrifugal action to which they are subjected they are made of considerable thickness and are consequently of considerable weight. The rotation of this weight at a high speed obviously requires more power to drive it at a certain speed than a bowl or drum of less weight would require.

The object of our invention is to construct a drum which combines the necessary strength with such an abnormal degree of lightness as is impossible to be obtained with the old construction, thus allowing either a very much larger quantity of liquid to be dealt with than heretofore with the same amount of power as is required to drive the ordinary bowl or drum or allowing the same amount of liquid as in an ordinary drum to be as effectually operated upon by the expenditure of a verymuch smaller amount of power, thereby enabling a much smaller and cheaper machine to equal in capacity the more expensive ones now in use.

In constructing a bowl or drum in accordance with our invention we provide a body or shell of the required shape made of aluminium, magnesium, or alloys of these metals of light specific gravity, or of wood, woodpulp, papier-mach, or other suitable material. This body or shell is of itself insufficient to bear the strain to which it would be subjected, and we therefore bind or coil around this vessel metal wire or ribbon (preferably steel) in order to provide the necessary strength and support the shell against the bursting strain. By the combination of this body or shell of light material with metal wire of high tensile strength an abnormally lightbowl is produced, which as compared with bowls composed of cast metal or of forged steel as now generally in use is of very much less weight, size for size, and of equal or greater strength. In some cases, where the nature of the material of which the shell is composed renders it advisable, the said shell may be provided with a liner or casing.

Our invention will be readily understood by reference to the accompanying drawings, in which'- Figure 1 is a sectional elevation of a bowl constructed according to ourinvention. Fig. 2 is a sectional plan. Fig. 3 is a sectional view illustratinga modification of our invention.

Similar letters of reference indicate corresponding parts in the several figures.

a is the bowl or drum, and b is the binding around the same, which binding will during the rotation of the bowl support the latter against the bursting strain to which it is subjected. In the drawings the binding is in the form of wire; but it will be obvious that metal tape or ribbon will be equally eflica= oious.

\Vhen the bowl a is made of a material with which the milk may come into direct contact without detriment, no internal lining is required. \Vhen, however, the bowl is made of a material such as wood, wood-pulp, papier-mach, or the like, we advantageously arrange within the bowl a liner 0, as shown in Fig. 3, made of thin sheet metal or other material, which will not injure or be acted upon injuriously by the milk.

In some instances instead of' using a liner inside a wood or like vessel we may use it inside a metal vessel-that is to say, the bowl would be composed of two layers of metal with a wire binding. Although in the drawings we have represented the bowl as having only a single layer of binding material, it is to be understood that two or more layers may be applied to the exterior of the bowl, if desired.

It is also to be understood that our invengle piece of papier-mach, having an external binding of wire wound tightly thereon, substantially as described.

3. As a new article of manufacture, a bowl for a centrifugal separator composed of a single piece of papienmzich provided with an external binding of Wire wound tightly there on, and a non-corrosive lining, substantially as described.

WILLIAM JOSEPH ASHWORTH.

THOMAS STEVINSON. \Vitnesses:

M. HAYES,

A. S. HARRISON. 

